The number of times a machine multiplies the effort force is the

Describe how the fermi level changes with donor level, temperature and contact with p and n type semiconductors

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Adding more pulleys to a system of pulleys needed to lift an object. a. increases the force b. decreases the force c. increases the amount of work d. decreases the amount of work